How does lcd work?

- Apr 26, 2018 -

It is known that the working principle of crt is that the filament is heated after being energized, the cathode is excited, and the electron current is emitted. The electron current is accelerated by the inner metal layer with a high voltage, and the lens is focused to form a very fine electron beam and hit on the fluorescent screen. Make the phosphor glow. And crt principle is completely different, lcd needs from the back of the light source, when the light beam through the layer of liquid crystal, liquid crystal will be side by side or an irregular twist shape, so the LCD is more like a gate, select the light penetration or not, we can See different shades of picture on the screen.At present, the mainstream liquid crystal display is a thin film transistor lcd (tftlcd), which is an extension of the original liquid crystal display technology. Tft liquid crystal has a semiconductor switch for each pixel, so as to completely control a single pixel, the liquid crystal material is sandwiched between the tft glass layer and the color filter layer, and the voltage value of the liquid crystal can be changed by changing the voltage value of the liquid crystal. Controls the last light intensity and color that appears.